If your not too busy... 1-tan^2X =1-2tan^2X 1+tan^2X
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Originally Posted by Dominic O'L If your not too busy... 1-tan^2X =1-2tan^2X 1+tan^2X What is the question? Solve for x ....?
No, just prove that they are equal.
Originally Posted by Dominic O'L No, just prove that they are equal. They're not. eg. Does it work for ....?
oh sorry i read the question incorrectly 1-tan^2X =1-2sin^2X 1+tan^2X
Originally Posted by Dominic O'L oh sorry i read the question incorrectly 1-tan^2X =1-2sin^2X 1+tan^2X First, use long division on the left hand side. You should find Remember that So , since ... .
Sorrry, but I think I'm supposed to solve it without sec.
Originally Posted by Dominic O'L Sorrry, but I think I'm supposed to solve it without sec. Then write it as . Same thing.
Hello Dominc O'L Grandad
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